Windshield wiper arm



Sqn. 15, 1942. M. MGI-:R

WINDSHIELD Y WIPER 4ARM Filed Sept. 25, 1941 Sheets-Sheet 1 MAX A165 Sept. 15,11942. 7M. zAlGER WINDSHIELD wIPER ARM Filed Sept'. 25. v1941 Z'SIhe'ets-Sheet 2 Patented Sept. 15, 1942 i I I.

UNITED s"r...1iTlf3sA .PATENT OFFICE.

wmnsnrzsgrsnaam Y' i Alipllatlmi enhlrlll N0. 412,269

This invention relates to windshield wiper arms, blank preferably used in vmaking the coupling and pertains more particularly to improvements member or clamp housing shown in Fig. 7;

in articulated, extensible arms of thecharacter Fig. 13 is a plan view ofla bushing locatedebedisclosed in my copending application Serial No. tween the clamp housing and the motor shaft; 392,269, iiled May 7, 1941. s Fig. 14 is a sectional Yvi'ew of the bushing, taken The principal purpose of the present invention` on line I 4-I4 of Fig. 13; Y

is to provide a wiper arm having a plurality of Figs. 15 and 16 are end'and side views, respec-J telescoping sections equipped with improved tively, of a screw-receivinghuliforming'part of means of simple, economical and eiiicient .con- -the clamping mechanism of thecoupling section; j

struction and design, forJ yieldably maintaining l0 and the respective sections in any desired position of Fig. 17, is a sectional view taken onl line Ill-i1 longitudnial adjustment, and also for limiting of Fig. 6. y relative movement of vthe sections in both direc' The improved wiper arm comprises a coupling tions. The improved structural features which section represented generailyat 2| (Fig. 1) and thus contribute to simplicity of manufacture and l5 adapted to be secured to the operating shaft 2 2 assembly, durability in operation, and ease of adof a wiper motor or other actuator; and anouter justment by the user will be hereinafter described or extensible portion `represented generally at22 and pointed out in the appended claims. and composed of three mutually telescoping sac-v Another object of the invention is to provide tions 24, .25 and 26 respectively;I the /forward a coupling section which is pivoted to the tele- 20 most section 26 being provided with a terminal or scoping sections of the arm and which has imend piece 21 to which a wiper blade may be re 'I proved means for releasably clamping the' arm movably connected. The outer. o r rearmost secto the shaft Vof the windshield wiper motor, 'tion 24 of the three telescoping sections is pivoted' whereby asec'ure attachment may be achievedby to the coupling section by a-pin 28 extending turning a screw the head of which is exposed on 25 through overlapping projections of .the sides 2l Vthe outside of the coupling section and serves also vof the channeled section 24 andthe sides I4- of a v to retain the cap orcover of that section in place.` substantially U-shaped metal link or clamp hous- 1i-recommended embodiment of the invention ing Il, respectively (Figa 2 and 3)." A cap or is illustrated in the accompanying drawings, in cover'lz which normally-'encloses the clamp houswhich: i Fig. 1 is aside view of the improved wiper arm; pivot 28; and-a clock spring 33, secured substan- Fig. 2 is an enlarged longitudinal section with tially in the manner described and claimed in my 30 ing and its associated parts is also' hinged at the parts in elevation, of theA coupling section and l said copending application. erial,lNo. 392,269, the rearward portion' of the telescoping sections; surrounds the pivot and serves to'f'urge-the tele'` Fig; '3. is a bottom view of the structure shown 35 scoping sections y:of tliefwipr arm" toward the in Fig. 2; 1

Fig; 4 isa view similar to Fig. 2, showing 'the blade against the" glass during oscillation of the forward portion of the telescoping sections; arm. I, 'v

Fig. 5is a bottomview of Fig.f4: In accordance with'the present invention, each windshield .(Fig'. y6)' and thus press the wiper Fig. v6 is a fragmentary view, showing the cou-` 40 of the three telescoping sections is channel shaped pling link ins-side elevation with itscovercap-and' to providemutually interfitting and slidabie top v pivot pinsinisection, anda portion of-oneof the .and side walls;4 and the sides of outer section 24 rearmost arm sections in tilted position; and intermediate section 2Q haveinwardly direct-y Fig.' 'I is afplan`=view`4 of. the coupling member l ed-ilanges providing spaced bottom walls and v with .certain attachments omitted: v415 .2l of the respective sections. VThe bottom iiang'ea Fig. 8' is'a section on line H of Eig. 'L 'with the 84 need not extend the full length of the section clamping screw in place: f

24, andv are relatively short'l asA shown in Figs.,

Fig..9 isagsection-oniine 4 0. of Fig. 2:1 2 and 3@ Section 2l does not require the bottom Fig. lo is a detail view,'partly in longitudinal flanges. but may' be provided 'with them ifl desection and partly in elevation, of the inner end no sired; and section 2l may be made. inl the form of the'intermelciiate teiescopingsection shown'inof a tube substantially square in crosssection.

pm 2; In order to restrain relative longitudinal movef Fig.- 1-1`is`adena view logging-to iets-6r mehr for. memiescoping sections and mmf-tne- 141510; l v partsin extendedorfother adjusted positions, Fig.-.' 12 is s .gpian view, tu` reduced scale, of ass spring members Si and- 31 of similar construction and arrangement are installed in a novel manner between the nat bottom walls of sections 24 and 25 and between the flat bottom wall of section 25 and the flat top of section 26, respectively. Each of these leaf springs is relatively short and bowed, and each is provided at one end with a shouldered anchoring lip preferably re-l ceived in a complemental slot to hold the spring in operative position. They lip 38 of spring 36 is engaged in aligned slots 40 formed in the bottom flanges 34 of section 24; and the lip 39 of spring 31 is engaged in similar slots 4| formed in the bottom flanges 35 of section 25 (Figs. 2 and 4). It will be apparent, however, that equivalent means may be employed for anchoring each spring against longitudinal movement in both directions; for example, the spring .could be formed with a shouldered lip or detent at each end to straddle the entire length of the bottom' wall to which it is applied, thereby avoiding the necessity of a special slot. l

The end portions of spring 36 thus bear on the bottom wall of the outer section 24, while the center of the-spring bears on the bottom wall of the intermediate section 25 (Figs. 2 and 9); and the end portions of spring 31 bear on the opposite side of the bottom walls of the intermediate section, while the center of that spring bears on the under side of the top wall of the inner section 26 (Fig. 4). This arrangement is most effective in accomplishingv the' purpose of the spring members, and it will be apparent that the two springs v are interchangeable and f relatively small size, so that they may be produced and assembled with economy and ease and` do not unduly increase the weight of the completed arm as contrasted with the springs heretofore employed or snown 1n my aforesaid application.

In order to limit relative movement of the telescoping sections and prevent accidental separation thereof, improved stop members are provided. Forward movement of the intermediate shoulder of the spring lip 39, as will be apparent from Fig. 4.

, It will thus be observed that forward or outward movement of said sections isv controlled by the spring members which are readily insertable into operative position after the telescoping sections are assembled. so that the springs serve a double purpose in a simple yet eilicient manner. Although the control of rearward or inward movement of these sections is not so critical or important, it will be evident that rearward movement of section 25 is limited by the engagement cf the Aend 'f said section with the end of the clock spring 33 which is fastened to the top of section 24 by a rivet 41 (Fig. 2); and that rearward movement vof section 216 is limited by engagement of the rear edge of the end piece 21 with the forward edge of section 25 (Fig. 4).

'I'he length of these sections is such that they may be telescoped together so that all of sections 25 and 26 (except the terminal 21) are contained withinsecnon 24 .when the wiper arm is closed,

illustrated Fig. 2. Bushing 53 As more fully expiamed' inlmy said copendingl application, one end of the clock spring 33 is secured to a sleeve or tube 49 or square or other polygonal cross-section, at least at its ends which are engaged in complemental, polygonal openings 50 (Fig. 12) in the sides 30 of the clamp housing 3l. The sleeve is fitted over the pivot 28, and serves to hold the inner end of the clock spring stationary with respect to the clamp housing; the opposite end of the spring being fastened to arm section 24 by the rivet 41 or otherwise, so that said arm section is constantly urged toward the windshieldas aforesaid. The forward ends 5I of sides 30 project into the channel of section 24 and serve to limit such movement, as indicated in Fig. 6, as disclosed in my aforesaid application; and the tension of the clock spring may be adjusted, if desired, as therein explained.

The U-shaped clamp housing 3l is formed with a -sleeve or end portion 52 adapted to receive a bushing 53 or other collar member placed over the reduced end of motor shaft 22 or forming part of the shaft end, the bushing being secured thereon by a nut 54 bearing against a washer 55 which is seated in the hollow bushing herein t is preferably stamped from sheet stock to provide a tubular collar and an inturned base flange of rounded contour (Figs. 13 and 14) which engages a tapering and preferably knurled shoulder of the motor shaft and thus prevents rotation of the bushing relative to the shaft when the nut 54 is tightened; and the edge of the annular flange forms a seat for the washer received in the bushing. The collar portion of the bushing 53 fits loosely in the rounded end portion 52 of the coupling link, until said end portion is clamped on the bushing by the improved clamping mechanism now to'be described.

Thesides of the housing 3l are provided with inwardly directed tabs 55, the opposed ends of which are spaced from each other. These tabs serve as a seat for the cover cap32 and as a bearing for the head of a clamping screw 56 which passes through an enlarged opening in the cover and betweenr said tabs.

A pair of spaced levers or pawls 51 are pivoted between the sides 30 by a pin 58 the ends of which are received in holes 59 of said sides; and a stub shaft 60 having a hub or trunnion 6I disposed between the levers 51, is journaled in said levers near their moveable ends which are normally in engagement with the collar portion of the bushing 53 (Fig. 3). threaded opening 62 in which the screw 56 is operatively engaged, so that the pawls 51 will be and may be extended to a very substantial ex-i the distance between said pivot and the points of engagement of said ends on the bushing or collai` 53, the pawls act in the manner of a cam or.

toggle when the screw 56 is tightened in the hub The hub 6| has a diametrical,

Gl, therebysecureiy clarnping the bushingbetween the lever ends andthe sleeve portion 52 ofV the coupling link and binding said link to the motor shaft. This vaction also "locks the cap paratus herein illustrated or describedmay be ed end, a clamp housing having spaced sides and a sleeve vportion at one end thereof, a pair of spaced clamping pawls disposedbetween said j sides and pivoted thereto, a hub journaled be-v tween the pawls and having a. threaded opening therein,l a screw threading in said hub for swinging the pawls on their pivot, a bushing loosely iitting in said sleeve .portion and adapted to re'- ceive the end of the shaft, anda nutfor thread-'- ingjon said shaft end'to secure the bushing theretothe free'ends ofthe-pawls being engageable with the' peripheryl of the bushing by tightening the screw in the hub, so that the housing is securely clamped to the bushing,` thevbushing being variedvto suit particular conditions without de- -15 hollow and having a collarportion and an inparting from the essence of my invention as de turned bottom flange of round contour, and-said fined in the appended claims. nut being received within the collar portion and I claim: Y 'hvmseatingonsaid flange, said :rounded ange beingv .1. A windshieid wiper arm having a-eouplingi engaeeablewith' a tapered shoulder of the dpat one end for connecting it to an operating shaft, 20 eratng lShaft So that it is'rmly fastened to the comprising a clamp housing' havingspaced sides shaftfbyA tightening Said'nut. 4. A coupling foriattaci'ring a windshieldwiper and a rounded end portion, a bushing -loosely received in said end portion and adapted to. be searm t0 alt-Operating shaft having a threaded cured to the' shaft, a clamping pawhpivoted at `end and tapering'shoulder'adiacent thereto. comone end between said sides and engageable lat its 25 DriSing a hOllOW bushing having a collar portion free end with said bushing, and screwmeans op: and an nturned bOttpmsange. aid flange being r erative between the sides of thFhous'Waatein'-i/ctionandfdptedt ft 0n. swinging the pawl on its pivot to press its free the shaft shoulder,'a mit fitting withinl the collar end' against the bushing and firmly clamp the portion of the-bushing vand seating on said Hanse. housing thereto. Y 30 the nut being enga'gable-witlrthe threaded end 2. In a windshield wiper arm adapted to be of theshaft so that lthe bushing is rmly secured connected to an operatingshaft having a threadtothe shaft by tightening the nut thereon, a ed end;aclampliilamsdgsides and' clamp housing col'inectedv tothe wiper arm and a sleeve portion at one end thereof,v a'pair of having an end portion looseiy'receiving theghushv spaced clamping pawls disposed betweensaid .'35 ing. and meansforclampin'g the bushing 'in "the i sides andpivotedthere'to, a hub journalled'be'-A housing.4 j A tween the pawls landhaving afthreaded opening 5, A' coupling for attaching a windshieldwiper` therein, a screwthreading in said'hub for swingarm to an operatingshaft .provided with a collar` Y ing the leversonsthg pivot, abushing looselyI portionrconipiisingva clamp housing connected itting in said sleeve portion and adapted tore- '40 tof the wiper arm aman" endjportion*y 1 cive theerrdofsthe shaft, and a' nutfor threadlooselyl receiving -the shaft collar', a clamping pawl -ing on said shaft end t0 secure the\:bus1ll!liA pivoted'within the housing and'having an end thereto, the fr ee ends of the pawls being enga'geensaseable Awith the periphery lof Said collar. and

meansinsaidihousing forswihging the pawl fto n able with the periphery of the bushing by tightening-the screw in the hub, ortha'tthe housing is 45 oprative position forl clamping the housing tothe co ar. v,

securely clamped to thebushfing;` Y 3. Infawindshieldwipel; arm adapted'to be MAXZAIGER; connectedto anoperating shaft havingathream" fw, j-l a -f 

